package com.guoranhao.tool.utils;

import java.util.*;

/**
 * Description:
 * Copyright (c) Department of Research and Development/Beijing
 * All Rights Reserved.
 *
 * @version 1.0 2018年06月22日 17:53 by 王广宇（wanggy@cloud-young.com）创建
 */
public class MapUtil {
    /**
     * map转为list 加key加value
     */
    public static List<Object> map2List(Map<String, ?> map){
        if(StringUtil.isEmpty(map)){
            return null;
        }
        List<Object> list = new ArrayList<Object>();
        for(Map.Entry<String, ?> entry : map.entrySet()){
            list.add(entry.getKey());
            list.add(entry.getValue());
        }
        return list;
    }


    /**
     * 从map中获得long
     */
    public static long getLong4Map(Map<String, ?> map,String key){
        return Long.parseLong(String.valueOf(map.get(key)));
    }

    /**
     * 移除map中的空值  空值判断 null ""
     */
    public static void removeEmptyValue(Map<String, ?> map){
        if(null == map || map.isEmpty()){
            return;
        }
        for(Map.Entry<String, ?> entry : map.entrySet()){
            if(StringUtil.isEmpty(entry.getValue())){
                map.remove(entry.getKey());
            }
        }
    }

    /**
     * 将map中value为空的去掉
     * @return
     */
    public static Map<String, ?> removeNull(Map<String, ?> map){
        if(StringUtil.isEmpty(map)){
            return map;
        }
        Iterator<? extends Map.Entry<String, ?>> it = map.entrySet().iterator();
        while(it.hasNext()){
            if(null == it.next().getValue()){
                it.remove();
            }
        }
        return map;
    }

    /**
     * 将Map的Object值转化为String
     */
    public static Map<String, String> obj2Str(Map<String, Object> map){
        if(null == map || map.isEmpty()){
            return null;
        }
        Map<String, String> res = new HashMap<String, String>();
        for(Map.Entry<String, Object> entry : map.entrySet()){
            res.put(entry.getKey(), String.valueOf(entry.getValue()));
        }
        return res;
    }

    /**
     * 将Map不为null的Object值转化为String
     */
    public static Map<String, String> obj2StrNotNull(Map<String, Object> map){
        if(null == map || map.isEmpty()){
            return null;
        }
        Map<String, String> res = new HashMap<String, String>();
        for(Map.Entry<String, Object> entry : map.entrySet()){
            if(null != entry.getValue()){
                res.put(entry.getKey(), String.valueOf(entry.getValue()));
            }
        }
        return res;
    }

    /**
     * 初始化Map
     */
    public static Map<String,String> initMap(String...args){
        Map<String,String> map=new HashMap<String, String>();
        if(args.length==0){
            return map;
        }
        int size=args.length%2==0?args.length:args.length-1;
        for (int i = 0; i < size;) {
            map.put(args[i++], args[i++]);
        }
        return map;
    }

    public static Map<String,Object> getMap(Object... params){
        if(null == params || params.length == 0){
            return null;
        }
        Map<String,Object> map = new HashMap<String, Object>();
        int size = (params.length%2==0?params.length:params.length-1);
        for (int i = 0; i < size;i = i+2) {
            map.put(String.valueOf(params[i]), params[i+1]);
        }
        return map;
    }

    /**
     * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串
     * @param params 需要排序并参与字符拼接的参数组
     * @param params 需要排除的key字段
     * @return 拼接后字符串
     */
    public static String map2String(Map<String, String> params, String exclude) {
        List<String> keys = new ArrayList<String>(params.keySet());
        Collections.sort(keys);
        StringBuffer prestr = new StringBuffer();
        for (int i = 0; i < keys.size(); i++) {
            String key = keys.get(i);
            if(exclude.equals(key) || null == params.get(key)){
                continue;
            }
            prestr.append("&" + key + "=" + params.get(key));
        }
        return prestr.substring(1);
    }
}
